If the respiratory rate is increased from 12/min to 24/min, and the tidal volume volume is decreased from 500 ml to 250 ml, then（）
A. alveolar ventilation will decrease
B. pulmonary ventilation will decrease
C. pulmonary ventilation will increase
D. alveolar ventilation will increse
E. alveolar ventilation does not change
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What kinds of channels open during the phase 2 of the ventricular action potential（）
A. Ca2+ channel and K+ channel
B. Na+ channel and K+ channel
C. Na+ channel and Cl- channel
D. Na+ channel and Ca2+ channel
Internal respiration is（）
A. gas exchange between the cells and the blood in the capillary
B. gas exchange between alveoli and blood in the capillary surrounding the alveoli
C. gas exchange between mitochondria and intracellular fluid
D. gas change between the cells in the tissue
E. gas exchange between alveoli and skeletal muscle cells
The major factor that cause the alveoli to collapse is（）
A. alveolar surface tension
B. contraction of smooth muscle in the bronchia
C. pleural pressure
D. atmosphere pressure
E. pulmonary pressure
The elasticity of the Windkessel vessel mainly influence（）
A. pulse pressure
B. Systolic pressure （Ps）
C. Diastole pressure （Pd）
D. peripheral venous pressure
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